glibc/sysdeps/x86_64/ffsll.c
H.J. Lu 34a27407f4 Check __ILP32__ instead of __LP64__
* elf/tst-auditmod1.c: Check __ILP32__ instead of __LP64__.
	* elf/tst-auditmod3b.c: Likewise.
	* elf/tst-auditmod4b.c: Likewise.
	* elf/tst-auditmod5b.c: Likewise.
	* elf/tst-auditmod6b.c: Likewise.
	* elf/tst-auditmod6c.c: Likewise.
	* elf/tst-auditmod7b.c: Likewise.
	* sysdeps/x86_64/ffsll.c (ffsl): Likewise.
	* sysdeps/x86_64/preconfigure.in: Likewise.
	* sysdeps/x86_64/preconfigure: Regenerated.
2012-04-13 16:24:17 -07:00

43 lines
1.3 KiB
C

/* ffsll -- find first set bit in a word, counted from least significant end.
For AMD x86-64.
This file is part of the GNU C Library.
Copyright (C) 1991-2012 Free Software Foundation, Inc.
Contributed by Ulrich Drepper <drepper@cygnus.com>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#define ffsl __something_else
#include <string.h>
#undef ffsll
int
ffsll (long long int x)
{
long long int cnt;
long long int tmp;
asm ("bsfq %2,%0\n" /* Count low bits in X and store in %1. */
"cmoveq %1,%0\n" /* If number was zero, use -1 as result. */
: "=&r" (cnt), "=r" (tmp) : "rm" (x), "1" (-1));
return cnt + 1;
}
#ifndef __ILP32__
#undef ffsl
weak_alias (ffsll, ffsl)
#endif